CMD 272 Lecture Notes - Lecture 4: Motor Neuron, Motor Unit, Anatomical Terms Of Motion

• School: URI
• Department: Communicative Disorders
• Course: CMD 272
• Professor: Milner Bethany

Document Summary

Cmd 272 - lecture 4 - muscle action. Skeletal muscles produce movement by acting on a joint found between the origin and insertion of the muscle simple machine . Source of force applied to a lever system which produces body movements. Bones act as lever arms, joint is the fulcrum. Lever arm with fulcrum at one end. Resistance force is somewhere between fulcrum and end of lever arm. Fulcrum at one end of the lever. Flexion - brings structures closer to the body. Extension - stretching of structures to their greatest length. Adduction - bringing structures toward the midline. Abduction - moving structures away from the midline. Rotation - moving structures toward (medial) or away (lateral) the midline. Pronation - palm of hands faces down or backward. Supination - palm of hands it turned upward or forward. Eversion - sole of foot turned outwards. Inversion - sole of foot turned inward. Opposition - thumb rolled into hand to grasp.